Update websockets samples
Add espSetConnData and espGetConnData to store data reference in EspReq
Add espSetNotifier to wrap notifiers and automatically call setConn
Rename espGetDir to espGetDocuments
Fix capturing ESP compilation errors when compiler emits positive non-zero status
Add BIT_INLINE definition for inline functions
Add websockets outgoing message sequence numbers
Refactor HTTP_EVENT_WRITABLE to be more predictable
Merge branch 'dev' of github.com:embedthis/appweb-4 into dev